问题
I just upgraded to PHP 7.3 and I'm getting this error:
Invalid body indentation level (expecting an indentation level of at least 4)
Here is the code:
$html = <<<HTML
<html>
<body>
HTML test
</body>
</html>
HTML;
回答1:
This is caused by the new flexible Heredoc syntaxes in PHP 7.3.
In previous versions of PHP, the closing marker was not allowed to have indentation:
$string = <<<EOF
Hello
EOF;
As of PHP 7.3, the closing marker can be indented.
In this example, EOF is indented by 4 spaces. The body of the string will also have 4 spaces stripped from the beginning of each line.
$string = <<<EOF
Hello
EOF;
If the closing marker is indented further than any lines of the body, it will throw a Parse error:
$string = <<<EOF
Hello
EOF;
The reason for the error message is two-fold:
- The closing marker is indented further than 1 or more lines within the body
But perhaps more likely, for those upgrading to PHP 7.3:
- I've chosen a marker
HTMLwhich is also present within the string. Because of the flexible spacing now allowed, PHP was incorrectly detecting that the string had closed before I intended.
来源：https://stackoverflow.com/questions/55523412/invalid-body-indentation-level-expecting-an-indentation-level-of-at-least-4